A Practical Guide for Engineers, EPCs, and Project Teams
Offshore platforms and marine vessels are among the harshest environments for instrumentation cables. Salt spray, high humidity, extreme temperatures, mechanical stress, fire risk, and the presence of explosive atmospheres create a unique set of challenges that demand cables far beyond those used in onshore facilities.
Selecting the wrong cable for marine or offshore service can lead to signal failure, safety incidents, costly downtime, and regulatory non-compliance. This guide provides a practical framework for specifying and selecting marine instrumentation cables, covering the key standards, construction requirements, and selection criteria that engineers, EPCs, and procurement professionals need to know.
1. The Marine and Offshore Challenge: What Makes It Different?
Offshore platforms and shipboard installations present a combination of environmental and operational challenges that distinguish them from onshore facilities:
| Challenge | Impact on Instrumentation Cables |
|---|---|
| Salt spray and humidity | Accelerated corrosion of conductors, shields, and armour; requires tinned conductors and corrosion-resistant materials |
| Hydrocarbon exposure | Sheath swelling, degradation, and failure; requires mud-resistant and oil-resistant sheaths |
| Extreme temperature variations | Thermal cycling causes expansion and contraction stress on cable structures and terminations |
| Fire risk (hydrocarbon pool fires) | Temperatures up to 1,100°C; cables must maintain circuit integrity for emergency and safety shutdown systems-40 |
| Explosive atmospheres | Zone 0, 1, and 2 hazardous areas require Ex-certified cables and glands-1 |
| Vibration and mechanical stress | Continuous movement and mechanical shock require robust cable construction and proper glanding |
| Drilling fluid (mud) resistance | Drilling mud and chemicals attack standard sheaths; NEK 606 cables require SHF2 mud-resistant sheaths- |
| Regulatory requirements | Multiple classification society approvals (DNV, ABS, Lloyd's, BV, RINA) and international standards- |
The key principle: Marine instrumentation cables must be designed for survival—not just signal transmission. They must withstand fire, corrosion, chemical attack, and mechanical stress while maintaining circuit integrity-40.
2. Applicable Standards: The Regulatory Framework
Marine instrumentation cables must comply with a complex web of international, national, and classification society standards. Understanding these standards is the first step in specifying the right cable.
2.1 IEC 60092-376: The Foundation
The IEC 60092-376 series is the primary international standard for electrical installations in ships, specifically covering cables for control and instrumentation circuits-. IEC 60092-376:2025 (4th edition) is the current version, which cancels and replaces the 2017 edition-1.
Key features of IEC 60092-376:2025:
| Feature | Details |
|---|---|
| Voltage rating | 150/250 V (300 V)--1 |
| Application | Screened and unscreened cables for control and instrumentation circuits on ships and offshore units- |
| Insulation | Extruded solid insulation- |
| Installation | Intended for fixed installations- |
| Construction and testing | Aligned with IEC 60092-350 unless otherwise specified-1 |
Significant technical changes in the 2025 edition-1:
Addition of a colour code for wires and tapes for unit identification-1
Addition of core numbering for multicore cables-1
Addition of design and test requirements for cables to be installed in explosive atmosphere areas-1
Addition of design and test requirements for cables to be installed between areas with and without explosive atmospheres-1
2.2 NEK TS 606: The Offshore Standard
NEK TS 606:2025 (7th edition) is the Norwegian Electrotechnical Committee specification for offshore cables, widely recognised as the global benchmark for offshore installations-20.
NEK TS 606:2025 covers-20:
Low and high voltage power cables
Control and lighting cables
Instrumentation and telecommunication cables
Fibre optic cables
Hydrocarbon fire-resistant (HCF) cables
Jet fire-resistant (JF) cables
Key NEK 606 features:
Halogen-free, low smoke, flame-retardant/fire-resistant (HFFR-LS)-20
Drilling fluid (mud) resistance — SHF2 mud-resistant sheaths-
Common NEK 606 cable designations-:
| Designation | Meaning |
|---|---|
| BFOU | Fire-resistant instrumentation cable (hydrocarbon fire) with mica glass tapes for added fire protection- |
| RFOU | Non-fire-resistant instrumentation cable (flame retardant only)- |
| HCF | HydroCarbon Fire resistant—tested to hydrocarbon fire curve |
| JF | Jet Fire resistant—tested to more severe jet fire conditions |
2.3 IEEE 1580: The North American Marine Standard
IEEE Std 1580 provides a consensus of recommended practices for the construction and testing of electrical power, signal, control, data, and specialty marine cable systems on shipboard--13.
Key features:
Cable types: Single or multiconductor cables, with or without metal armour and/or jacket-13
Voltage rating: 300 V to 35 kV AC (RMS phase-to-phase) or up to 2000 V DC-13
Installation: Intended for installation aboard marine vessels, fixed and floating offshore facilities-13
Application guidance: For cable application and installation guidelines, refer to IEEE Std 45.8 for shipboard applications and API RP 14F or API RP 14FZ for fixed and floating offshore facilities-13.
2.4 IEEE 1810: Hydrocarbon Fire Installation Guide
IEEE 1810-2017 provides guidance on the installation of fire-rated, power, control, and instrumentation cables suitable for hydrocarbon pool fires, as typically used in petroleum and chemical plants and offshore marine platforms--40.
Purpose:
Provides a guide for the installation of fire-rated circuit integrity cables-40
Defines performance requirements for cables or cable systems subjected to hydrocarbon pool fires-40
Addresses materials and installation practices-40
2.5 Classification Society Approvals
Marine and offshore cables must carry approvals from classification societies:
| Classification Society | Abbreviation | Region |
|---|---|---|
| Det Norske Veritas | DNV | Norway/International |
| American Bureau of Shipping | ABS | USA |
| Lloyd's Register | LR | UK |
| Bureau Veritas | BV | France |
| Registro Italiano Navale | RINA | Italy |
Cables are typically approved to IEC 60092-376 with additional approvals from these societies-. Approvals may vary between manufacturers, so verification is essential-.
3. Cable Construction Requirements
Marine instrumentation cables must meet specific construction requirements to survive the harsh offshore and shipboard environment.
3.1 Conductors
| Requirement | Specification | Why It Matters |
|---|---|---|
| Material | Tinned copper (preferred) or bare copper- | Tinning provides corrosion resistance in salt-spray environments |
| Stranding | Class 2 (stranded) or Class 5 (flexible) per IEC 60228- | Stranded conductors provide flexibility and vibration resistance |
| Typical sizes | 0.5 mm² to 1.5 mm² for instrumentation | Based on signal type, distance, and loop resistance |
Tiankang recommendation: For marine and offshore applications, always specify tinned copper conductors. The tin coating protects against corrosion that would otherwise compromise signal integrity over time.
3.2 Insulation
| Material | Characteristics | Applications |
|---|---|---|
| XLPE (Cross-linked Polyethylene) | Excellent electrical properties, high temperature rating, moisture resistance | General offshore instrumentation |
| EPR (Ethylene Propylene Rubber) | Flexible, good electrical properties, high temperature rating | Offshore cables requiring flexibility |
| PE (Polyethylene) | Low dielectric constant, good electrical properties | High-performance signal cables |
| FEP (Fluorinated Ethylene Propylene) | High temperature resistance, chemical resistance | High-temperature and aggressive environments |
3.3 Shielding — IS, OS, and IS+OS
Shielding is critical for instrumentation cables on offshore platforms, where electromagnetic interference from VFDs, motors, and communications equipment is prevalent.
| Shielding Configuration | Description | Best For |
|---|---|---|
| Individual Screen (IS) | Each twisted pair has its own screen (typically aluminium/polyester tape with drain wire)- | Eliminating crosstalk between pairs |
| Overall Screen (OS) | A single screen around the entire cable core- | Protection against external EMI |
| IS + OS (Dual Screen) | Individual screens on each pair plus an overall screen | Maximum protection—critical analogue signals and IS circuits |
Shielding materials-:
Aluminium/polyester tape with tinned copper drain wire
Tinned copper wire braid-
Tiankang note: For offshore instrumentation, IS+OS dual screening is the gold standard. Individual screening prevents internal crosstalk, while overall screening protects against external EMI from VFDs and other high-power equipment.
3.4 Sheath Materials
The sheath is the cable's first line of defence against the marine environment. Sheaths must meet the requirements of IEC 60092-360-.
| Material | Characteristics | Applications |
|---|---|---|
| SHF1 | Halogen-free, flame retardant, low smoke — according to IEC 60092-360- | General offshore use |
| SHF2 | Halogen-free, flame retardant, low smoke, mud resistant- | Drilling platforms, mud exposure |
| LSZH (Low Smoke Zero Halogen) | Fire-safe, low smoke, no toxic gases- | Confined spaces, offshore modules |
| LSZH thermoplastic polyolefin | Orange or grey sheaths for marine applications- | Shipboard installations |
Mud resistance (SHF2): For drilling platforms, cables must resist drilling mud, cutting fluids, and chemicals. NEK TS 606 specifies mud-resistant cables with SHF2 sheaths that comply with IEC 60092-360-.
Tiankang recommendation: For offshore platforms, choose SHF2 sheaths whenever drilling fluids or hydrocarbons may be present. For areas with strict fire safety requirements, ensure the sheath is also halogen-free and low smoke-20.
3.5 Armour
Armour provides mechanical protection against impact, abrasion, and marine life activity.
| Armour Type | Characteristics | Applications |
|---|---|---|
| Tinned copper wire braid armour- | Provides both mechanical protection and enhanced EMI shielding | Applications requiring both armour and enhanced EMI protection |
| Steel wire armour (SWA) | Excellent mechanical protection, tensile strength | High mechanical stress, vertical runs |
Tiankang note: On offshore platforms, armoured cables are typically required for:
Direct burial or exposed runs where mechanical damage is possible
Runs in cable trays subject to foot traffic or falling objects
Areas with marine life activity
4. Fire Performance Requirements
Fire is one of the most significant risks on offshore platforms. Cables must be designed to maintain circuit integrity during a fire, particularly for emergency shutdown (ESD), fire pumps, and critical instrumentation circuits.
4.1 Flame Retardance
| Standard | Requirement | Application |
|---|---|---|
| IEC 60332-1-2 | Single cable vertical flame test- | Basic flame retardance |
| IEC 60332-3-22 Cat A | Bunched cable flame test—Category A (most stringent)- | Cable-dense areas, offshore platforms |
4.2 Fire Resistance (Circuit Integrity)
| Standard | Application |
|---|---|
| IEC 60331-21 | General fire-resistant cables (750–830°C, 90 minutes)- |
| Hydrocarbon fire resistance (HCF) | 1,100°C hydrocarbon pool fires—specified in NEK TS 606 and IEEE 1810- |
| Jet fire resistance (JF) | 1,300°C jet fires—specified in NEK TS 606-20 |
| BFOU (NEK 606) | Fire-resistant instrumentation cable with mica glass tapes- |
Hydrocarbon fire resistance: Offshore platforms are subject to hydrocarbon pool fires, which can reach 1,100°C. Cables for emergency systems must maintain circuit integrity at these extreme temperatures. IEEE 1810 provides the installation guide for these cables-40.
BFOU-HCF cables are fire resistant, flame retardant, low smoke and halogen free, used for emergency instrumentation, communication, control and alarm systems that need to be operational during a hydrocarbon fire-.
4.3 Low Smoke Zero Halogen (LSZH)
| Standard | Requirement | Application |
|---|---|---|
| IEC 60754-1/2 | Halogen gas (pH ≥4.3, conductivity ≤10 µS/cm)- | Corrosion protection for equipment and personnel |
| IEC 61034-2 | Smoke density (transmittance ≥60%)- | Visibility during evacuation |
Tiankang note: On offshore platforms, LSZH cables are essential in confined spaces such as control rooms, accommodation areas, and enclosed cable galleries. Halogen-free cables prevent the release of toxic and corrosive gases during a fire-20.
4.4 Hydrocarbon and Chemical Resistance
| Requirement | Standard | Application |
|---|---|---|
| Hydrocarbon resistance | IEC 60811-404, in conditions according to IEC 60092-360 SHF2- | Protection against oil and hydrocarbon exposure |
| Oil resistance (SHF2) | IEC 60811-404- | Drilling platforms, mud exposure |
5. Type Approval and Certification
Marine and offshore instrumentation cables must carry type approval from recognised classification societies-.
5.1 Required Approvals
| Approval | Issuing Body | Typical Requirement |
|---|---|---|
| DNV | Det Norske Veritas | Most widely required for offshore and shipboard- |
| ABS | American Bureau of Shipping | Required for US-flagged vessels and some offshore- |
| Lloyd's Register (LR) | Lloyd's Register | UK and international shipping- |
| BV | Bureau Veritas | French and European shipping- |
| RINA | Registro Italiano Navale | Italian and Mediterranean shipping- |
DNV type-approved cables must demonstrate resistance to NOVA Plus, Petro-free LE, and other drilling fluids-.
5.2 Additional Certifications
| Certification | Standard | Application |
|---|---|---|
| CE | EU directives | European market access- |
| RoHS | EU directive | Restriction of hazardous substances- |
6. Selection Summary Table
| Selection Factor | Recommended Specification | Why |
|---|---|---|
| Conductor | Tinned copper, stranded (Class 2 or 5)- | Corrosion resistance, flexibility |
| Insulation | XLPE or EPR | High temperature rating, good electrical properties |
| Shielding | IS+OS (dual screen) for analogue; OS for discrete- | Maximum EMI protection |
| Sheath | SHF2 (mud-resistant, halogen-free, LSZH)- | Chemical resistance, fire safety |
| Armour | Tinned copper wire braid or steel wire | Mechanical protection, EMI shielding |
| Fire resistance | Hydrocarbon fire-resistant (HCF) for critical circuits- | Maintain circuit integrity at 1,100°C |
| Flame retardance | IEC 60332-3-22 Cat A- | Prevents fire spread |
| Ex certification | As required for hazardous areas-1 | Hazardous area compliance |
| Standards | IEC 60092-376:2025, NEK TS 606, IEEE 1580--20 | Regulatory compliance |
| Approvals | DNV, ABS, Lloyd's, BV, RINA- | Classification society requirements |
| Voltage rating | 150/250 V (300 V)- | Instrumentation circuit standard |
7. Common Mistakes to Avoid
| Mistake | Consequence | Correct Practice |
|---|---|---|
| Using bare copper conductors offshore | Corrosion, signal failure | Specify tinned copper conductors |
| No mud resistance on drilling platforms | Sheath degradation, cable failure | Specify SHF2 sheaths for mud-exposed areas |
| Single screening only | Crosstalk or EMI issues | Use IS+OS dual screening for critical analogue signals |
| No fire resistance for emergency circuits | Loss of ESD/fire pump control during fire | Specify hydrocarbon fire-resistant (HCF) cables for critical circuits- |
| Non-LSZH cables in enclosed areas | Toxic smoke, equipment corrosion | Specify LSZH for all enclosed spaces-20 |
| Incorrect Ex certification | Safety incident, regulatory violation | Verify certification matches zone, gas group, and T-class-1 |
| Ignoring classification society approvals | Non-compliance, project delays- | Verify DNV/ABS/Lloyd's approvals as required |
| Using outdated IEC 60092-376:2017 | Non-compliance with current regulations-1 | Specify IEC 60092-376:2025 |
8. Why Choose Anhui Tiankang for Marine Instrumentation Cables?
Anhui Tiankang (Group) Co., Ltd. has been manufacturing industrial cables for nearly five decades. Our marine instrumentation cables are designed to meet the most demanding offshore and shipboard requirements.
Product capabilities:
Conductors: Tinned copper, stranded, with corrosion protection-
Insulation: XLPE, EPR, and other high-performance materials
Shielding: IS, OS, and IS+OS configurations with aluminium/polyester tape and tinned copper drain wires-
Sheaths: SHF1, SHF2 (mud-resistant), and LSZH options-
Armour: Tinned copper wire braid and steel wire armour-
Fire performance: Flame retardant (IEC 60332) and fire resistant (IEC 60331, hydrocarbon fire)-
Standards: Compliant with IEC 60092-376:2025, NEK TS 606, and IEEE 1580 requirements--20
Core advantages:
Complete certifications: CCC Ex, ATEX, IECEx, DNV, ABS, Lloyd's, BV, RINA-
CNAS-accredited laboratory: Full testing for electrical, mechanical, fire, and environmental performance
Proven track record: Long-term supplier to offshore oil and gas projects
Complete package: From instrumentation to cables to Ex cable glands—one-stop supply
9. Conclusion
Selecting instrumentation cables for marine and offshore systems requires a systematic approach:
Identify the environment — Offshore platform, drilling vessel, or shipboard?
Apply the standards — IEC 60092-376:2025 is the foundation-; NEK TS 606 for offshore-20; IEEE 1580 for North American marine applications-
Specify the correct construction — Tinned copper conductors, appropriate insulation, IS+OS shielding for critical signals, SHF2 sheaths for mud resistance-
Verify fire performance — Hydrocarbon fire resistance (HCF) for critical emergency circuits-
Confirm approvals — DNV, ABS, Lloyd's, BV, RINA as required-
Ensure Ex certification — For cables installed in explosive atmosphere areas-1
Key takeaways:
Always specify tinned copper conductors for corrosion resistance-
Use IS+OS dual screening for critical analogue signals
Choose SHF2 sheaths for mud and chemical resistance-
Specify hydrocarbon fire-resistant cables for emergency and safety circuits-
Ensure LSZH for enclosed spaces-20
Verify classification society approvals—DNV, ABS, Lloyd's, BV, RINA-
Use the latest standard — IEC 60092-376:2025-1
With nearly five decades of experience and a complete range of marine-capable instrumentation cables, Anhui Tiankang is your trusted partner for offshore and shipboard instrumentation.
Contact Us
For marine instrumentation cable selection advice, technical documentation, or project quotations, please contact:
Yin Shuangjie
International Sales Manager
📧 Email: [email protected]
📱 WhatsApp / Zalo: +86 17856068126
🌐 Website: http://www.tiankang-global.com/
Anhui Tiankang – Your partner for reliable marine instrumentation cable solutions.
